Electric-lamp socket.



A'. H. NERO.

ELECTRIC LAMP SOCKET.

rum-non FILED JAN. 9, 1 14.

Patented Mar. 9, 1915.

gum/urea REV/ 0 NERO 3513 /6 Quart c1 5 UNITED STATES PATENT OFFICE.

ARVID H. NERO, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE A RROWELECTRIC COMPANY, OF HARTFORD, CONNECTICUT, CORPORATION OF CONNECTICUT.

' ELECTRIC-LAMB socKE'r.

Specification of Letters ma.

To all whom tit-may concern:

Be it known that I, ARV-ID H. NERO, a citizenof the United States ofAmerica, and residing at New Britain, in the county of -Hartford andState of Connecticut, have invented a certain new and Improved Electric-Lamp Socket, of which the following is a specification.

My invention relates to electric lamp sockets and the object of myinvention is to provide a simple and eiiicient device for locking a lampin inserted position.

In the accompanying drawings, Figure 1 in which my form; Fig. 2

showing the operation of this locking device; Fig. 3 is a detachedpartial'section showing the elements of the locking device; Fig. 4 is adetached elevation of the shell terminal and locking plate of thesocket; and Fig. 5 is a vertical section through the shell of a lampsocket showing a modified form of locking screw, the latter being showndetached from its boss.

The present invention may be applied to sockets of various types, but ishere applied for the sake of illustration, to a key socket of ordinarytype, comprising the usual cap 10 and shell ll'forming a casing throughwhich projects the usual switch key 12. The insulating socket body 13within the casing carries the screw shell 14 forming one of theterminals for the threaded base 15 of an incandescent lamp 16 which isscrewed therein. An insulating lining 17 surrounds the screw shell 14and insulates it from the shell 11 of the casing.

To prevent the unauthorized removal of a lamp from the socket afterinsertion, I form an aperture 18 in the screw shell IXiat a convenientpoint,-preferably in line below the I key 12, since the latter is alwaysplaced in accessible position,

manner a clamping plate 19 a portion of which is adapted to be projectedthrough the aperture 18 in the screw shell and bear against the insertedlamp base. As here shown the clamping plate is riveted at its upper end20 to the screw shell and its lower end is roughened at 21 to aflordabetter grip upon the lamp base. 'Any suitable means may be employed toforce this clamping plate against the lamp base. The means here shown,comprise a and arrange upon the, socket in any suitable locking screw 22carried by an internally threaded boss 23 mounted on the shell casinPatented Mar. 9, 1915.

11 in register with the aperture 18, and pro-- lamp it is of course onlynecessary to turn the screw outward thus releasing the pressure upon theplate 19, and permitting the lamp to be unscrewed. As a simplemodification of this type of locking screw I have shown in Fig. 5spindle 26, the head of which is provided with a cain face 27 bear ingagainst a cooperating cam face 28 on the inner end of the boss 29. Thepitch of these cam faces is such that the head of the locking screw isadvanced and retracted more rapidly than would be the case with screw 22above described, unless the pitch of the thread of the latter were madeunusually high. N 0 means, other than the in-' sulating lining 17 of thesocket, is needed to prevent? the locking spindle from fallingam awarehowever, no one has hitherto arranged inside the lining a clamping plateor the like which is forced against the lamp base by pressure againstthe insulating lining, hus completely obviating the danger which resultsfrom contact with the electrically alive terminal of the lamp base.

I claim as my invention 1. An electric lamp socket comprising a metalliccasing, an insulating lining therefor, an apertured terminal for alampbase within said lining. a clamping plate supported within said liningand having a portion lying in register with the aperture in thelamp'terminal, and locking means carried by the socket casing andbearing upon register I I I I 'withfla lampbase inserted in saidterminal with the free end of said clampto force the latter through theterminal into engagement with to lock the latter against in register ingplate apertu'red the lamp base withdrawal.

-2. An electric shell terminal, an insulating lining interposed betweensaid casing and terminal, and meansc'arried by saidcasing and bearingupon 'athe outer face of; said'lining but in with the 'free ends of saidclamping tongue to force the latter into engagement and lock thesame'against withdrawal.

Y 3. An electric .lampsocket comprisinganapertured screw-shell terminal,a clamping piece adapted to be advanced through the ape'rtu'rein saidterminal into engagement with an inserted lamp base, a socket casingsurrounding said terminal and means car- A ried by said casing inregister with the aperv Coplen'o! thin patent, bt'flbtfliltl for lampsocket, having an apertured screw shell terminal for a lamp base, aclamping tongue extending into saidaperture, a socket casing surroundingsaid ture in said screw shell terminal and insulated from said clampingpiece for forcing the latter into engagement with the lamp 'base to lockthe latter against withdrawal.

4. An electric lamp socket comprising a screw shell terminal having anaperture in the side thereof, a clamping plate secured to said shell andhaving a portion in register with said aperture, a socket casingsurrounding said screw shell, insulating tween said termlnal and casing,in combination with a locking screw carried by said casing in registerwith the aperture in the terminal and bearing upon the outer face ofsaid insulating material but in register with the free end of theclamping five cents each, by addressing the Commissioner of Patents.

Washington, D. 0."

material beplate to force the latter inward, for the purpose described.

